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Hydroxypropyl methyl cellulose

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Hydroxypropyl methyl cellulose (HPMC) HPMC is a nonionic water soluble cellulose mixed ether. White or white powder particles, odorless, odorless, nontoxic, slightly hygroscopic. With methyl cellulose in performance is roughly the same, but its characteristics has characteristics of dispersion, emulsification, thickening, adhesion, water retention, film forming, thermal gelation, its solubility in organic solvents than methyl cellulose and hydroxyethyl cellulose is superior, and in gel temperature in aqueous solution with methyl cellulose is much higher. The proportion of the two genes is different, and they are different in performance.
1. appearance: white or white powder, odorless, odorless, nontoxic.
2. apparent density: O.4-0. 70g/cm3
3. discoloration temperature: 190-200 degree carbonization temperature 225-230 degrees
4. surface tension: 42-56dyn/cm
Four, product performance
The product combines a lot of physical and chemical properties to become a unique product with many uses. The properties are as follows:
1. Water solubility
The product can be dissolved in water in different parts, and the highest concentration is limited only by the viscosity.
2. Organic solubility
The product is dissolved in some organic solvents, such as a proper proportion of ethanol / water, propanol / water, two chloroethane and two organic solvents.
3, nonionic inertia
The product belongs to nonionic cellulose ether, which does not produce insoluble precipitation with metal salts or other ions.
4, thermal gelation
The water solution of the product is heated to a certain temperature to form a gel, and the formed gel becomes a solution after cooling.
5, surface activity
The surface activity is provided in the solution to achieve the required emulsification and protective colloid as well as phase stability.
6, suspension
The precipitation of solid particles can be prevented, thus the formation of precipitates can be inhibited.

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